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Reorganization - Summary of Roll Forward of Activity in Reorganization Accrual (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]        
Additions    $ 37 $ 1,905 $ 1,431
Workforce Reduction [Member]
       
Restructuring Cost and Reserve [Line Items]        
Accrual Beginning Balance     14  
Additions     1,905  
Cash payments     (1,655)  
Accrual Ending Balance $ 264   $ 264